Electromagnetic torque depends on air-gap flux produced by the stator.

Rotor power factor ($\\cos(\\phi_{2})$) dictates how much of the rotor current produces active torque.

Shaft diameter is calculated based on the allowable shear stress to withstand the torque, not the cause of the torque.

Changes in supply voltage affect flux, significantly altering the torque ($T \propto V^{2}$).

High starting torque with wound rotor motors

Robust construction for industrial environments

Torque is highly sensitive to voltage fluctuations

High inrush current during DOL starting

Industrial pumps and compressors

Conveyor belts and HVAC systems

Rotor EMF ($E_{2}$) is proportional to slip ($s$).

Option B (shaft diameter) is a mechanical specification for sizing the component to handle transmitted stress, not an electrical parameter affecting the production of torque.

The rotor current ($I_{2}$) and rotor power factor ($\\cos(\\phi_{2})$) are fundamental variables in the standard torque equation.